package com.kob.matchingsystem.service.impl.utils;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.locks.ReentrantLock;

@Component
public class MatchingPool extends Thread{
    private static List<Player> players = new ArrayList<>();
    private ReentrantLock lock = new ReentrantLock();
    private static RestTemplate restTemplate;

    private final static String startGameUrl = "http://127.0.0.1:3030/pk/start/game/";
    @Autowired
    public void setRestTemplate(RestTemplate restTemplate){
        MatchingPool.restTemplate = restTemplate;
    }

    public  void addPlayer(Integer userId,Integer rating,Integer botId){
        lock.lock();
        try {
            players.add(new Player(userId,rating,botId,0));

        }finally {
            lock.unlock();
        }
    }
    public void removePlayer(Integer userId){
        lock.lock();
        try {
            List<Player> newPlayers = new ArrayList<>();
            for(Player player: players){
                if(!player.getUserId().equals(userId)){
                    newPlayers.add(player);
                }
            }
            players = newPlayers;
        }finally {
            lock.unlock();
        }
    }

    private void increaseWaitingTime(){
        for (Player player: players){
            player.setWaitingTime(player.getWaitingTime() + 1);
        }
    }

    private boolean checkMatched(Player a,Player b){//判断两名玩家是否匹配
        int ratingDelta = Math.abs(a.getRating() - b.getRating());
        int waitingTime = Math.min(a.getWaitingTime(),b.getWaitingTime());
        return ratingDelta <= waitingTime*10;
    }
    private void sendResult(Player a,Player b){//向主程序返回匹配信息
//        System.out.println("send result" + a + " " + b );
        MultiValueMap<String,String> data = new LinkedMultiValueMap<>();
        data.add("a_id",a.getUserId().toString());
        data.add("a_bot_id",a.getBotId().toString());
        data.add("b_id",b.getUserId().toString());
        data.add("b_bot_id",b.getBotId().toString());
        restTemplate.postForObject(startGameUrl,data,String.class);
    }
    private void matchPlayers(){//尝试匹配所有玩家
//        System.out.println("match plays" + players.toString());
        boolean[] used = new boolean[players.size()];
        for(int i = 0;i<players.size();i++){
            if(used[i]) continue;
            for(int j = i+1;j<players.size();j++){
                if(used[j])continue;
                Player a = players.get(i),b = players.get(j);
                if(checkMatched(a,b)) {
                    used[i] = used[j] = true;
                    sendResult(a, b);
                    break;
                }
            }
        }
        List<Player> newPlayers = new ArrayList<>();
        for(int i = 0;i< players.size();i++){
            if(!used[i]) {
                newPlayers.add(players.get(i));
            }
        }
        players = newPlayers;

    }


    @Override
    public void run() {
        while(true){
            try {
                Thread.sleep(1000);
                lock.lock();
                try {
                    increaseWaitingTime();
                    matchPlayers();
                }finally {
                    lock.unlock();
                }


            } catch (InterruptedException e) {
                e.printStackTrace();
                break;
            }
        }
    }
}
